I don't think its native to your area (maybe it's invasive?) but it looks like a Pentidotea wosnesenskii aka a green isopod
http://en.wikipedia.org/wiki/Pentidotea_wosnesenskii
http://www.wallawalla.edu/academics/departments/biology/rosario/inverts/Arthropoda/Crustacea/Malacostraca/Eumalacostraca/Peracarida/Isopoda/Valvifera/Family-Idoteidae/Idotea_wosnessenskii.html
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